JP3297193B2 - Automatic marking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotatable drum for holding a printing plate attached to an outer peripheral portion thereof, a platen roller which rotates while being in contact with the printing plate via a conveyed sheet.
The present invention relates to an automatic marking device having an elastic roller that rotates while applying a contact with a printing plate to apply ink to the printing plate, and a transfer unit that moves a drum by a predetermined distance in an axial direction based on marking position information.

[0002]

2. Description of the Related Art For example, when a resident's card or a seal registration certificate is issued at a branch office of a government office, it is necessary to copy the manuscript or apply an authentication seal to a form printed in accordance with print data transmitted from the head office. is there. For the copying and transmission printing operations described above, high-precision copying machines and facsimile machines have been developed so that a large number of slips can be created. However, an automatic stamping operation device has not yet been sufficiently developed. For example,
Japanese Patent Application Laid-Open No. Hei 1-306277 discloses that in a process of transporting a sheet sent from an image output device, an image symbol printed on the sheet is read by a line sensor, the feeding speed of the sheet is determined, and the feeding speed is synchronized with the sending speed. There is disclosed an invention of an interlocking type automatic authentication and imprinting device for driving a paper conveyance motor by using a motor. According to this conventional technique, the sheet conveying speed is synchronized with the sheet feeding speed of the image output device, so that skewing of the sheet conveyed in the apparatus main body can be prevented. Moreover, the spline shafts that support the drum around which the printing plate is provided are fitted so that the ridges provided along the axial direction of the mating surfaces of the spline shafts are engaged with each other, and the drum is moved in the axial direction. Enable the stamp position on the paper vertically,
Both can be set arbitrarily in the horizontal direction.

[0003]

However, in the above prior art, since the ink roller for applying ink to the printing plate provided around the drum has no ink replenishing mechanism, every time a reduction in the printing density is visually checked. The ink must be manually replenished by dropping it onto the ink roller. However, the ink impregnated amount of the ink roller tends to be uneven, and therefore, the printing density tends to be uneven. In order to make the ink impregnation amount of the ink roller uniform, it is possible to repeat the break-in operation a plurality of times, but paper and ink are wasted. Further, the frequent ink replenishment work is not only troublesome, but also has a high risk of soiling hands and clothes, which is a sparse operation for the operator. Although it is conceivable to use the ink roller as a replacement part, the maintenance cost is high. Also, so that the printing plate is pressed uniformly on the paper being conveyed,
A spring for applying a tensile force is attached to both ends of the ink roller shaft and the spline shaft. When the drum around which the printing plate is moved toward the end of the spline shaft, the spring is applied to the printing plate by the spring. Since the pressure is different at both ends in the axial direction, the printing density unevenness occurs. Furthermore, when stamping on paper using a different printing plate, or when using the same printing plate with a different printing direction, it is necessary to replace the printing plate around the drum each time. This was necessary, and this work was cumbersome. The present invention has been made to attempt to resolve such problems in the conventional art, in the different printing plate, it is possible stamp the sheet by selecting a desired printing die to replacement without operation, the platen roller It is an object of the present invention to provide an automatic marking device that can prevent ink contamination, or can evenly apply a pressing force of a printing plate to a platen roller even when a drum moves to an axial end thereof.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention holds a conveying means for conveying a conveyed sheet at a predetermined speed, and a printing plate attached to an outer peripheral portion along a peripheral surface. A rotatable drum, a platen roller that rotates while being in contact with the printing plate transported by the rotating drum and the conveyed paper, and a rotating platen roller that contacts the printing plate that is transported by the rotating drum. An elastic roller for applying ink to the printing plate; a driving unit for applying a rotational force to the drum and the rollers; and a transfer unit for moving the drum by a predetermined distance in the axial direction based on marking position information. the automatic stamping apparatus, the drum and before the printing die and the platen roller to be transferred by the drum rotating <br/> rolling order to the contact or non-contact state It has interval control means for controlling the interval with the platen roller, a plurality of the printing plates are mounted on the outer peripheral portion of the drum at a predetermined mounting angle along the peripheral surface, and the printing plate is operated by the stamping operation. Only when approaching the stamped portion between the elastic roller and the platen roller, the interval control means controls the interval between the drum and the platen roller so that the printing plate comes into contact with the platen roller. Things. Alternatively , the platen roller is rotatably supported via a bearing fixed to the apparatus main body, and the elastic roller is rotatably supported by a support rotatable around a fulcrum fixed to the apparatus main body, and stamping is performed. In operation, the printing plate, which rotates while contacting via a sheet conveyed by the rotating drum and conveyed to the platen roller, is pressed against the platen roller by the gravity of the elastic roller or the like applied to the support. It is like that.

[0005]

[Action] During隔制control means controls the distance between the drum and the platen roller, only when the seal plate by stamping operation approaches the seal portion between the elastic roller and the platen roller,
The plate and the platen roller are brought into contact. Further, the printing plate is rotated while pressed against the platen roller by gravity such as an elastic roller applied to the support.

[0006]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 11 is an arrangement diagram showing an arrangement state of the automatic stamping machine and the copying machine main body according to one embodiment of the present invention. FIG.
In the present embodiment, reference numeral 1 denotes an automatic stamping machine according to the present embodiment for automatically stamping an authentication stamp on a sheet on which a form has been printed, which is ejected from the copying machine main body I;
Reference numeral denotes a paper discharge shelf for depositing sheets discharged from the copying machine main body I, and reference numeral 5 denotes a communication cable which connects the copying machine main body I and the automatic stamping machine 1 and serves as an information transmission medium between them. A command for starting the stamping operation of the automatic stamping machine 1 and information on the size and orientation of the paper are transmitted from the copying machine main body I via the communication cable 5.

FIG. 1 is a front view showing the internal structure of the automatic stamping machine 1. The sheet discharged from the copying machine main body I is carried in from a sheet carry-in port shown by an arrow A in FIG. 1 and is paired with transport rollers 13a, 13b arranged along guide plates 11a, 11b, 11c, 11d for guiding the sheet. Is transported toward the seal section. A cylindrical printing drum 21 that rotates clockwise and a platen roller 12 that is disposed below the printing drum 21 are arranged opposite to the marking section.
The sheet that has passed through the stamping section is conveyed along guide plates 11e and 11f, discharged out of the apparatus by sheet discharging rollers 14, and deposited on a sheet discharging tray 16. The paper holding roller 15 is pressed against the platen roller 12 only when the paper is transported, and transports the paper in cooperation with the platen roller 12. The loaded paper is detected by the entrance sensor 17 and the paper sensor 1
8 detects the sending timing to the seal portion, and the paper discharge sensor 19 detects the discharge of the paper. The printing drum 21, an ink pad roller 22 formed of a sponge, which is an elastic body capable of being impregnated with the ink, and is rotated along with the ink pad roller 22 to supply ink to the ink pad roller 22 when ink is supplied. The ink replenishing roller 23 that is supplied and formed of an elastic foam of the same material as the ink pat roller 22 constitutes the marking unit 2 together with an auxiliary side plate and the like that support these rollers. The marking unit 2 is rotatably supported by a drive shaft 8, and the other rotating end is supported by a guide rail 9 against which a guide roller 28 rotatably attached to the outer end of the rotation end abuts. I have. On the outer circumferential surface of the printing drum 21, the printing plates 20 a and 2 are formed concentrically with the outer circumferential surface in pairs.
When the printing plate drum 21 rotates, the ink pad roller 22 contacts and rotates with the printing plates 20a and 20b which are narrower than the printing plate drum 0b. Printing plates 20a, 20
When b is at the position shown in FIG. 1, a part of the virtual cylindrical surface including the outer peripheral surfaces of the printing plates 20 a and 20 b enters the inside of the platen roller 12. Accordingly, the printing drum 21
Are rotated, and the printing plates 20a and 20b are
Is pressed up against the gravity of the marking unit 2 by the platen roller 12 rotatably supported by the main body side plate. At the time of exchanging the printing plates 20a and 20b, the drive shaft 8 is detached, the handle 30d of the marking unit 2 is gripped, and the entire marking unit 2 is automatically stamped by the automatic stamping machine 1.
It can be removed from the main unit. This makes it possible to easily replace and remove the printing plates 20a and 20b attached to the outer peripheral portion of the printing plate drum 21.

FIG. 2 is a perspective view of the inside of the automatic stamping machine 1 as viewed from the front upper left. As shown in FIG. 2, a main motor 10 drives the paper transport system and the stamping operation of the stamping section. That is, a drive pulley 53 attached to the end of the drive shaft of the main motor 10, a first pulley 54 attached to one end of the rotation shaft of the discharge roller 14, an idle pulley 55, and a rotation shaft of the platen roller 12. Pulley 56 attached to one end of the drive shaft 8
A second timing belt 51 is stretched between a third pulley 57 attached to one end of the first pulley and a driving force is transmitted to the first to third pulleys 54, 56, 57.
As described above, the drive shaft 8 is fitted to the marking unit 2, and supports the marking unit 2 so as to be slidable in a direction perpendicular to the sheet conveying direction. On the other hand, a fourth pulley 58 is attached to the other end of the rotation shaft of the platen roller 12 to which the second pulley 56 is attached, and a fifth pulley 5 attached to one end of the rotation shaft of one transport roller 13b.
9, the driving force transmitted to the rotation shaft of the platen roller 12 is transmitted to the transport roller 13b. further,
The driving force transmitted to the rotating shaft of the transport roller 13b is transmitted to the transport roller 13a via gear groups 60, 61, and 62 meshing with each other.
It is also transmitted to.

FIG. 3 is a partial perspective view of the inside of the automatic stamping machine 1 viewed from the same direction as FIG.
3 is a plan view of a sliding movement drive mechanism of the marking unit 2. FIG.
As shown in these figures, a first timing belt 50 is provided at the paper loading side end of the marking unit 2 with its edge 50.
a, 50b are fixed by a connecting plate 501 and bolts 502. The first timing belt 50 is the fourth
A sixth pulley 65 and a gear 67 are attached to both ends of a rotary shaft to which the fifth pulley 64 is attached, which is bridged between the pulley 63 and the fifth pulley 64. The driving force is transmitted to the sixth pulley 65 from a fourth timing belt 69 bridged between the sixth pulley 65 and a driving pulley 66 attached to a rotation shaft of a driving motor 70. The gear 67 meshes with a gear 68 attached to a rotation shaft of the encoder 71, and transmits the rotation of the fifth pulley 64 to the encoder 71 to thereby transmit the rotation to the encoder 71.
Can detect the amount of movement of the first timing belt 50. A detection plate 72 is screwed to the upper end of the printing unit 2 where the connection plate 501 is attached at the paper loading side end so as to cover the upper traveling portion of the first timing belt 50. Moving end sensors 73a, 73b are attached to an upper horizontal plate (not shown) fixed between the main body side plates 7a, 7b so that the maximum moving position of the marking unit 2 can be detected.

FIG. 5 is a front view of the marking unit 2 showing a rotating mechanism of the paper pressing roller 15. As shown in FIG. 5, the paper press roller 15 is rotatably supported at the tip of a lever 75. The lever 75 is rotatably supported on a lever shaft 78 integrally with the arm 76. The tip of the arm 76 is rotatably engaged with the link 77 via the pin 79, and the horizontal movement of the link 77 by the suction operation of the solenoid 80 is converted into the rotation of the lever 75. . 5 between the lever 75 and the auxiliary side plates 30a, 30b.
Spring 81 for urging lever 75 clockwise with
Is attached. Reference numeral 27 denotes a driven roller rotatably attached to a support shaft passing through the auxiliary side plates 30a and 30b constituting a part of the casing of the marking unit 2, and reference numeral 82 designates a clockwise rotation operation of the lever 75. This is a restraining pin that restrains at the position. In the present embodiment, the paper sent to the stamping section is conveyed by the paper press roller 15 and the platen roller 12, thereby ensuring the short conveyance of the sheet at the stamping section and the maintenance of good stamping quality. ing. In FIG. 5, the rotation mechanism of the paper press roller 15 on one side is shown, but the same paper press roller 15 and its rotation mechanism are provided on the other side.

This embodiment includes a vertical movement mechanism of the marking unit 2 for moving the marking unit 2 up and down at a predetermined timing in order to mark only a predetermined position of the conveyed paper. FIG. 6 is a perspective view of a main part of the marking unit 2 showing a mechanism for moving the marking unit 2 up and down. As shown in FIG. 6, a cam shaft 101 rotatably supported between main body side plates 7a and 7b.
Is fixed at a predetermined position, and the cam 6 is provided so as to face the driven rollers 27 rotatably mounted on the side surfaces of the auxiliary side plates 30a and 30b of the marking unit 2, respectively. The disk encoder 102 and the gear 103 are fixed to the outer side of the main body side plate 7a of the cam shaft 101, and the gear 103 meshes with the gear 104 fixed to the driving shaft of the vertical motor 100, so that the vertical motor 100
Is transmitted to the cam 6. Disk encoder 1
Optical sensors 105a and 105b for detecting the amount of rotation of the cam 6 are attached to the main body side plate 7a at predetermined mounting angles via mounting plates so as to sandwich the outer peripheral portion of the cam 02. Approximately 1
Two notches (not shown) are formed at an angle of 80 degrees.

FIG. 7 is a perspective view of a main part showing a driving mechanism of the printing drum 21, and FIG. 8 is a printing drum 2 showing a printing detection drive mechanism.
1 is a front view of FIG. A gear 34 fixed to the rear end of the drum shaft of the printing drum 21 meshes with a reduction gear 35, and the reduction gear 35 slidably fits into a gear groove formed on the outer peripheral surface of the drive shaft 8. By meshing with the gear 36, the drive shaft 8
Can be transmitted to the printing drum 21. Clutch plate 33 that rotates integrally with printing drum 21
Is attached to the rear end of the drum shaft adjacent to the gear 34. The outer peripheral surface of the clutch plate 33 has a gentle inclined surface in one direction at an angle of about 180 degrees with respect to the drum shaft. The two notches 33a that are provided are formed. The clutch claw 32 is disposed at a position facing the outer peripheral surface of the clutch plate 33 so as to be rotatable around the pin 39. One end of the clutch claw 32 is rotatably engaged with the tip of the link of the solenoid 31. The clutch claw 32 is urged in the clockwise direction in FIG. 7 by the elastic force of a spring (not shown), and when the other end of the clutch claw 32 is located at a position facing the notch 33a. It falls into it and engages. Clutch claw 32
When the notch 33a is engaged with the other end of the
Slides and rotates with respect to the clutch plate 33. A disk encoder 37 is fixed to the other end of the drum shaft. Two notches 37a and 37b are formed on the outer periphery of the disk encoder 37 at an angle of about 180 degrees.
Then, so as to sandwich the outer periphery of the disk encoder 37,
A printing plate position sensor 3 that detects the amount of rotation of the drum shaft to detect the standby positions of the printing plates 20a and 20b and the end position of imprinting.
8a and 38b are attached to the body frame by attachment members (not shown). As shown in FIG.
7b is formed wider with respect to the notch 37a, so that the detection light of the printing plate position sensors 38a and 38b can be transmitted therebetween. These notches 37a, 37
Due to the difference in the notch width b, the positions of the printing plates 20a and 20b attached at an interval of about 180 degrees can be distinguished and detected. In FIG. 8, reference numeral 30c denotes a case of the marking unit 2, and a handle 30d is attached to an upper portion of the case 30c.

FIG. 9 is a vertical sectional view of the automatic stamping machine 1 taken along a cutting line XX 'shown in FIG. Ink supply roller 2
3 and the ink supply motor 25 are connected to the ink roll frame 4
5 and a fifth timing belt 48 between a seventh pulley 47 fixed to one end of the drive shaft of the ink supply motor 25 and an eighth pulley 39 fixed to one end of the rotation shaft of the ink supply roller 23. And transmits the driving force of the ink supply motor 25 to the ink supply roller 23. The ink roll frame 40 is rotatably supported by a support shaft 49 that supports the driven roller 27. A screw spring 29 that is loosely fitted to the support shaft 49 is attached between the ink roll frame 40 and the auxiliary side plate 30a,
The ink supply roller 23 is urged in a direction to approach the ink pad roller 22. FIG. 10 is a schematic diagram of an ink supply urging mechanism that can significantly reduce the frequency of ink supply work by an operator. On the front surface of the ink roll frame 40, a support arm 41 is provided so as to fit loosely into the through hole 46 of the auxiliary side plate 30a. A lever 42 that is rotatable around a rotation fulcrum 43 is provided such that one end can be brought into contact with and separated from the tip of the support arm 41. The other end of the lever 42 is attached to the other end of a spring 45, one end of which is attached to the operating rod of the solenoid 44. In normal operation, the lever 4 is attracted by the operation rod by the bias of the solenoid 44.
2 rotates, one end thereof pushes up the tip of the support arm 41, rotates the ink roll frame 40 around the support shaft 49, and separates the ink supply roller 23 from the ink pad roller 22. Since the ink impregnated in the ink pat roller 22 is depleted by the thousands of times of the stamping operation, it is necessary to replenish the ink for the new impregnation. At the time of ink supply, when the switch 85 is pressed, the solenoid 44 is deenergized and the ink supply motor 25 rotates only while the switch 85 is pressed. When the solenoid 44 is deenergized, the ink roll frame 40 rotates in the reverse direction by the urging force of the screw spring 29, and the ink supply roller 23 comes into contact with the ink pat roller 22, and supplies ink to the ink pat roller 22. The rotation speed of the ink supply motor 25 that is energized at the same time as the deenergization of the solenoid 44 is set so that the peripheral speed at the contact portion between the ink supply roller 23 and the ink pad roller 22 becomes the same. This enables ink supply by pressing the switch 85 even during the sealing operation. The ink extension roller 24 made of a plastic material is driven by the ink supply roller 23 to perform a function of spreading the ink dropped on the ink supply roller 23 over the entire surface of the ink supply roller 23. Since the ink replenishing roller 23 is formed of an elastic foam as described above, the ink replenished roller 23 is well impregnated with the dropped ink and does not hang down. An unillustrated cover for covering the upper portion of the ink supply roller 23 is provided with an ink supply port (not shown) having a width slightly smaller than the width of the ink supply roller 23, so that the ink supplied at the time of ink supply can be supplied to the ink supply roller. Leakage from the end of 23 is prevented. When refilling the ink, the upper cover 110 is opened, and the ink contained in the bottle is dropped onto the ink supply roller 23 from the ink supply port.

Next, the stamping operation of the automatic stamping machine 1 will be described. Printing plate 2 screwed onto outer peripheral surface of printing drum 21
For example, 0a and 20b can mount different types of printing plates. For example, mounting the same printing plate having different mounting directions and corresponding to different orientations of paper discharged from the copier body I in the vertical and horizontal directions. Then, the printing plates 20a and 20b can be separately printed as shown in FIG. 12 according to the information such as the paper size and the paper direction transmitted from the copying machine main body I. In the following description, it is assumed that the same printing plates 20a and 20b having different mounting directions are mounted on the printing drum 21, but of course, the different printing plates 20a and 20b are different.
The same applies to the case where 0b is mounted. As described above, the marking unit 2 is slidable in a direction perpendicular to the sheet conveying direction. In the present embodiment, the home position of the marking unit 2 is set to each of the marking unit 2 and the sheet to be conveyed. It is set at a position where the center in the direction perpendicular to the transport direction coincides. Therefore, as shown in FIG. 12, if the direction perpendicular to the paper transport direction is the x direction and the reverse direction of the paper transport is the y direction, the marking unit 2 is printed in accordance with the information necessary for the printing stamp transmitted from the copier main body I. The distances x ₁ and x ₂ that have to travel to the designated position are extremely short.

First, prior to the sealing operation, the copying machine main body I
Information such as the size of the paper and the orientation of the paper discharged from the printer and carried into the automatic stamping machine 1 is transmitted via the communication cable 5. Information about the distance x from the home position to the seal portion in the direction perpendicular to the paper transport direction from the home position and the distance y from the leading edge of the paper to the seal portion in the paper transport direction is input in advance. Therefore, a control unit (not shown) of the automatic stamping machine 1 calculates the above-mentioned distances x and y based on information such as the size and direction of the sheet transmitted from the copying machine main body I, and further calculates the driving motor 70 from the distance x. The rotation amount is calculated, the driving motor 70 is rotated according to the calculation result to move the marking unit 2, and the encoder 71
When a predetermined rotation amount of 0 is detected, the rotation is stopped. The marking unit 2 slides and moves with the drive shaft 8 fitted to the paper carry-in side end, and the guide roller 28 rotatably attached to the paper discharge side end comes into contact with the guide rail 9 and rolls. .
Further, the control unit of the automatic stamping machine 1 determines which of the stamps 20a and 20b is to be stamped from the information of the orientation of the sheet transmitted from the copying machine main body I, and determines that the stamp is the home position of the stamp. That is, it is determined whether or not it is at the position indicated by the printing plate 20a in FIG. This is a printing plate position sensor 38 shown in FIG.
The detection is performed by detecting two notches 37a and 37b provided on the outer peripheral portion of the disk encoder 37 by the a and 38b. That is, when both the printing plate position sensors 38a and 38b detect the wide notch portion 37b, the printing plate 20a is moved to the home position when only the printing plate position sensor 38a detects the small notch portion 37a. Is determined. For example, when the printing plate 20 specified by the copying machine main body I is not at the home position, that is, when the printing plate 20 is located on the side opposite to the home position, the printing plate 20 is moved to the home position.

When the control unit of the automatic stamping machine 1 determines that the printing plate 20 specified by the copying machine main body I is not at the home position, it rotates the vertically moving motor 100 to rotate the cam 6 having the maximum diameter. The cam 6 is rotated until the outer peripheral portion of the cam contacts the outer peripheral portion of the driven roller 27. Since the support position of the cam shaft 101 is fixed, the driven roller 27 that comes into contact with the cam 6 is pushed up with the rotation of the cam 6, so that the support shaft 49 that supports the driven roller 27 is pushed up, and the marking unit 2 is moved. It can be lifted with the drive shaft 8 as a fulcrum. As a result, the virtual cylindrical surface including the outer peripheral surfaces of the printing plates 20a and 20b comes out of the platen roller 12, and does not contact the platen roller 12 even when the printing plates 20a and 20b rotate. 12 can be moved to the home position without being contaminated with ink. Then, the solenoid 31 is driven to rotate the clutch pawl 32 counterclockwise in FIG. 7 so that the other end of the clutch pawl 32 and the notch 3
By disengaging 3a, the clutch plate 33, that is, the printing drum 21 can be driven to rotate. And printing drum 2
When 1 is driven and rotated about half a turn, the disk encoder 3
The printing plate position sensors 38a and 38b detect any one of the notches 37a and 37b formed on the outer periphery of the printing plate 7. In accordance with the detection signal, the control unit releases the bias of the solenoid 31 and engages the other end of the clutch claw 32 with the notch 33a on the opposite side, thereby causing the designated printing plate 20 to wait at the home position. . When the printing plate 20 stops at the home position,
The vertical motion motor 100 is rotated to stop the cam 6 until the small flat outer peripheral portion of the cam 6 contacts the outer peripheral portion of the driven roller 27. When the printing drum 20 is driven to rotate and the printing plate 20 moves to the home position, the printing drum 2
Since 1 rotates clockwise as shown in FIG.
The printing plate 20 comes into contact with the ink pad roller 22 and ink is applied to the surface. Also, during the first stamping operation,
Even if 0 is at the home position, ink is applied to the surface of the printing plate 20 by rotating the printing drum 21 once. When the passage mode is selected, the cam 6 remains held at a position where the outer peripheral portion where the diameter becomes maximum contacts the driven roller 27.

Next, when the paper conveyed from the paper carry-in entrance A is detected by the entrance sensor 17, the main motor 10 starts rotating, and the transport rollers 13a and 13b, the platen roller 12, and the paper discharge roller 14 rotate. And the solenoid 8
0 is urged, and the lever 75 rotates counterclockwise to bring the driven roller 15 into contact with the platen roller 12 to be driven to rotate. When the sheet conveyed by the pair of conveying rollers 13a and 13b is detected by the sheet sensor 18, time measurement is started from that time and synchronized with the conveying time corresponding to the distance y of the stamped portion from the leading edge of the sheet in the sheet conveying direction. do it,
The solenoid 31 is biased, and the engagement between the other end of the clutch claw 32 and the notch 33a is released. As a result, the printing drum 21 is driven to rotate, and the printing paper is brought into contact with the printing paper 20 to perform the printing. At this time, since the flat outer peripheral portion of the cam 6 is kept in contact with the outer peripheral portion of the driven roller 27, the printing drum 21 is slightly contacted by the printing plate 20 and the platen roller 12. Can be lifted. Also,
As described above, since the printing plate 20 comes into contact with the platen roller 12 via the paper conveyed by the weight of the printing unit 2, a uniform pressing force is applied to the paper regardless of the printing position. No unevenness occurs. When the first stamping operation is completed, the energization of the solenoid 31 is released when the printing plate drum 21 rotates half a turn, the other end of the clutch claw 32 and the notch 33a are engaged, and the printing drum 21 stops. Further, the engraving unit 2 is returned to the home position by the urging of the drive motor 70. Next, when the second sheet is ejected from the copying machine main body I and information necessary for stamp printing is transmitted, the same stamping operation as the above-described first stamping operation is repeated.

[0018]

As described above, according to the first aspect of the present invention, there is provided the interval control means for controlling the interval between the drum and the platen roller so that the printing plate and the platen roller are in a contact state or a non-contact state. Then, a plurality of printing plates are attached to the outer peripheral portion of the drum along the peripheral surface at a predetermined mounting angle at a predetermined mounting angle, and only when the printing plate approaches the printing portion between the elastic roller and the platen roller by the printing operation, Since the interval control means has controlled the plate and the platen roller to be in contact with each other, it is possible to attach a desired plate to the drum by mounting two different plates, or two plates appropriately selected from the same plate having different directions. The printing plate can be selected and stamped on the conveyed paper without any replacement operation, and ink contamination of the platen roller during rotation of the printing plate that does not need to be stamped can be prevented.

According to the second aspect of the present invention, the driven roller rotatably supports the elastic roller and is attached to a support rotatable around a fulcrum fixed to the apparatus main body, and the driven roller rotates on the apparatus main body. Since the interval control means is constituted by a freely supported cam, the interval control means can be formed simply and at low cost. According to the third aspect of the present invention, the platen roller is rotatably supported via the bearing fixed to the apparatus main body, and the elastic roller is rotated to a support rotatable about a fulcrum fixed to the apparatus main body. The printing plate is freely supported and, during the stamping operation, the printing plate is pressed against the platen roller by the gravity of the elastic roller or the like applied to the support, so that the printing plate can be moved even when the drum moves to the axial end side. The pressing force against the platen roller can be made uniform. According to the invention described in claim 4 , the marking unit is constituted by the drum, the elastic roller, and the support frame that integrally and rotatably supports the drum and the elastic roller, and the marking unit is detachable from the apparatus main body. This facilitates the work of replacing the printing plate, cleaning the printing plate and the elastic roller, and the like. According to the fifth aspect of the present invention, the platen roller is rotatably attached to the support arm rotatably attached to the end of the marking unit in the direction perpendicular to the paper transport direction, and only when the transport means transports the paper. Since the paper pressing roller rotates while contacting the paper, the paper can be transported without causing a transport error even when the paper is transported without the stamping operation or when the paper having the curl is transported.

[Brief description of the drawings]

FIG. 1 is a front view showing an internal configuration of an automatic stamping machine according to one embodiment of the present invention.

FIG. 2 is a perspective view of the inside of the automatic stamping machine as viewed from the upper front left.

FIG. 3 is a partial perspective view similar to FIG. 2, and an enlarged perspective view of a main part thereof.

FIG. 4 is a plan view of a sliding movement drive mechanism of the marking unit.

FIG. 5 is a front view of a marking unit showing a rotation mechanism of a paper press roller.

FIG. 6 is a perspective view of a main part of the stamping unit, showing a vertical movement mechanism of the stamping unit.

FIG. 7 is a perspective view of a main part showing a driving mechanism of the printing drum.

FIG. 8 is a front view of a printing drum showing a printing plate detection drive mechanism.

FIG. 9 is a longitudinal sectional view of the automatic stamping machine taken along a cutting line XX ′ shown in FIG.

FIG. 10 is a schematic diagram of an ink supply biasing mechanism.

FIG. 11 is an arrangement diagram showing an arrangement state of an automatic stamping machine and a copying machine main body according to an embodiment of the present invention.

FIG. 12 is an explanatory diagram of a stamping operation in which the same printing plate having different mounting directions is mounted and the printing plates are separately printed.

[Explanation of symbols]

 2 Marking Unit 6 Cam 8 Drive Shaft 9 Guide Rail 10 Main Motor 12 Platen Roller 13 (a, b) Conveyance Roller 15 Paper Press Roller 20 (a, b) Printing Plate 21 Printing Drum 22 Ink Pad Roller 23 Ink Supply Roller 24 Ink stretching roller 25 Ink supply motor 27 Follower roller 28 Guide roller 32 Clutch pawl 33 Clutch plate 37,102 Disk encoder 38 (a, b) Printing plate position sensor 40 Ink roll frame 49 Support shaft 70 Drive motor 100 Vertical motor

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Hashimoto 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Hideo Abe 3-1-10 Omori Minami, Ota-ku, Tokyo Inside the Ohashi Works (72) Inventor Seiichi Hasegawa 3-1-10 Omori Minami, Ota-ku, Tokyo Stock Company Inside the Ohashi Works (72) Yoshinobu Hirano 3-1-10 Omori Minami, Ota-ku, Tokyo Stock Company (56) References JP-A-53-51020 (JP, A) JP-A-5-169637 (JP, A) JP-A-61-175459 (JP, U) (58) Fields studied (Int) .Cl. ⁷ , DB name) B41K 3/00 B41J 13/02 B41K 3/12 B41K 3/44 B41K 3/60

Claims (5)

(57) [Claims] 1. A conveying means for conveying a conveyed sheet at a predetermined speed, a rotatable drum for holding a printing plate attached to an outer peripheral portion along a peripheral surface, and the mark transferred by a rotating drum. A platen roller that rotates while contacting via a sheet conveyed to the plate, an elastic roller that rotates while applying contact with the printing plate transferred by a rotating drum to apply ink to the printing plate, In an automatic marking device including a driving unit that applies a rotational force to each of the rollers and a transfer unit that moves the drum by a predetermined distance in the axial direction based on the marking position information,
The printing plate having interval control means for controlling an interval between the drum and the platen roller so that the printing plate transferred by the rotating drum and the platen roller are in a contact state or a non-contact state. A plurality of pieces are attached to the outer peripheral portion along the peripheral surface at a predetermined attachment angle, and only when the printing plate approaches a marking portion between the elastic roller and the platen roller by a marking operation, the gap is set. An automatic marking device, wherein the control means controls the distance between the drum and the platen roller to bring the printing plate into contact with the platen roller. 2. An interval control means rotatably supports an elastic roller and is attached to a support rotatable around a fulcrum fixed to the apparatus main body, and is rotatably supported by the apparatus main body. 2. The automatic marking device according to claim 1 , wherein the automatic marking device is constituted by a cam. 3. A conveying means for conveying the conveyed sheet at a predetermined speed, a rotatable drum for holding a printing plate attached to an outer peripheral portion along a peripheral surface, and the mark transferred by a rotating drum. A platen roller that rotates while contacting via a sheet conveyed to the plate, an elastic roller that rotates while applying contact with the printing plate transferred by a rotating drum to apply ink to the printing plate, In an automatic marking device including a driving unit that applies a rotational force to each of the rollers and a transfer unit that moves the drum by a predetermined distance in the axial direction based on the marking position information,
The platen roller is rotatably supported via a bearing fixed to the apparatus main body, and the elastic roller is rotatably supported by a support rotatable around a fulcrum fixed to the apparatus main body, and is used during a stamping operation. The printing plate, which is rotated by being contacted via a sheet conveyed by the rotating drum and conveyed to the platen roller, is pressed against the platen roller by gravity of the elastic roller or the like applied to the support. An automatic marking device characterized by the following. 4. A marking unit is constituted by a drum, an elastic roller, and a support frame that integrally and rotatably supports the drum and the elastic roller, and the marking unit is detachable from an apparatus main body. automatic marking apparatus according to claim 1 or 3, wherein the. 5. The printing unit is rotatably mounted on a support arm rotatably mounted on an end of the marking unit in a direction perpendicular to the paper transport direction, and rotates while contacting the platen roller only when the paper is transported by the transport means. 5. The automatic marking device according to claim 4, further comprising: